I don't think 'nobody' is name-calling. It's accurately, if not tactfully, describing a status of fame and recognition. He is not famous at all, and regardless of what we may or may not like about chiptunes and electronica, it is a niche market for people. His response to the confusion (which admittedly is frustrating and annoying) is simply confirmation of this lack in status. How much frustrating interaction on social platforms does your average minor celebrity (internet or otherwise) deal with? How do they respond, or do they even respond at all?

We are what we are by the actions we take. Reactive actions are still actions, and they stand alone at the end of the day. If you react to negativity with more negativity, that's telling of you, not the negativity that fed that action. It's human to lash out, but it's also human to choose not to do so.